Perhaps I say at all the wrong (right?) hotels but... I stay in close to two dozen North American hotels a year and I haven't noticed this trend? Many have pocket doors but I can't think of a hotel in recent memory that was missing it completely. I usually partially close them so it's not as cold getting out of a shower so I hope I would have taken note if it wasn't there.

It's been a while since I've stayed in one but separation in Yotels seemed to be pretty much missing. Can't think of other chains in particular.